Class 7 Biology Forests: Our Lifeline Deforestation


  • Deforestation is the conversion of forested areas to non-forested ones..
  • Causes of deforestation
  1. Slash and burn jhum cultivation.
  2. Famers cut down the trees of the forest and burn the plant remains.
  • Ash is used as fertilizer.
  1. Land is used for farming or cattle grazing,
  2. If land is left uncultivated for several years replenishment of minerals occur.
  • Effects of deforestation
  1. Enhanced carbon dioxide concentration in the atmosphere.
  • Loss of biodiversity.
  • Disturbs hydrologic cycle
  1. Soil erosion
  2. Desertification in extreme cases.
  • Reforestation is the process of restoring a forest that once existed but was removed at some point of time.
  • The Government of India has recently instituted the Amrita Devi Bishnoi Wildlife Protection Award.
  • Government of India has introduced the concept of Joint Forest Management (JFM) so as to work closely with the local communities for protecting and managing forests.
  • Chipko movement was started by local women of Garhwal Himalayas to protect trees.


Fig. deforestation 


Fig. reforestation

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